[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki41\/ai-phoenicis-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki41\/ai-phoenicis-wikipedia\/","headline":"AI Phoenicis – Wikipedia","name":"AI Phoenicis – Wikipedia","description":"before-content-x4 From Wikipedia, the free encyclopedia after-content-x4 Star in the constellation Phoenix AI Phoenicis is a variable star in the","datePublished":"2020-03-09","dateModified":"2020-03-09","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki41\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki41\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","url":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","height":"1","width":"1"},"url":"https:\/\/wiki.edu.vn\/en\/wiki41\/ai-phoenicis-wikipedia\/","about":["Wiki"],"wordCount":3664,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4From Wikipedia, the free encyclopedia       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Star in the constellation PhoenixAI Phoenicis is a variable star in the constellation of Phoenix. An Algol-type eclipsing binary, its apparent magnitude is constant at 8.58 for most of the time, sharply dropping to 9.35 during primary eclipse and to 8.89 during secondary eclipse.[3] The system’s variability was discovered by W. Strohmeier in 1972.[9] From parallax measurements by the Gaia spacecraft, the system is located at a distance of 560 light-years (171 parsecs) from Earth,[2] in agreement with earlier estimates based on its luminosity (173 \u00b1 11 parsecs).[4]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4The primary star is a K-type subgiant with a spectral type of K0IV and an effective temperature of 5,000\u00a0K, while the secondary is an F-type main sequence star with a spectral type of F7V and a temperature of 6,300\u00a0K. The primary component, while visually fainter, is slightly more luminous than the secondary due to its higher infrared output.[4] The primary is at the end of its main sequence life and is likely in the short contraction phase known as a hook, where core hydrogen fusion has ceased but shell burning has not yet started, before ascending towards the red giant branch.[6] Photometric and spectroscopic observations have allowed the direct determination of the parameters of the stars with extreme precision, and this system is frequently used to test stellar evolution models.[7][4][6][10] The masses of the stars, 1.247 M\u2609 for the primary and 1.197 M\u2609 for the secondary, are known to a precision of just 0.3%, while the radii of 2.91 R\u2609 and 1.84 R\u2609 have uncertainties of 0.8% and 0.5% respectively.[6] Stellar evolution models show the stars have a common age of about 4.4 billion years.[6]The orbit of AI Phoenicis has a period of 24.59248 days and a moderate eccentricity of 0.1821 \u00b1 0.0051. The observation of eclipses is allowed by its 88.5\u00b0 inclination to the plane of the sky. Times of minimum light show the orbital period of the system is not constant,[6] which can be caused by a third star in the system. An analysis of the alignment of the system by the Rossiter\u2013McLaughlin effect suggests that the secondary star rotation axis is not aligned with the orbital axis, with an angle of 87 \u00b1 17\u00b0 between them, which also indicates interactions with a third star.[11]Investigations continue with the TESS observatory in 2020.[12]References[edit]^ “MAST: Barbara A. Mikulski Archive for Space Telescopes”. Space Telescope Science Institute. Retrieved 8 December 2021.^ a b c d e f Brown, A. G. A.;  et\u00a0al. (Gaia collaboration) (August 2018). “Gaia Data Release 2: Summary of the contents and survey properties”. Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A…616A…1G. doi:10.1051\/0004-6361\/201833051. Gaia DR2 record for this source at VizieR.^ a b c Samus’, N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). “General catalogue of variable stars: Version GCVS 5.1”. Astronomy Reports. 61 (1): 80. Bibcode:2017ARep…61…80S. doi:10.1134\/S1063772917010085. S2CID\u00a0125853869.^ a b c d e f g h i j k l Torres, G.; Andersen, J.; Gim\u00e9nez, A. (2010). “Accurate masses and radii of normal stars: Modern results and applications”. Astronomy and Astrophysics Review. 18 (1\u20132): 67\u2013126. arXiv:0908.2624. Bibcode:2010A&ARv..18…67T. doi:10.1007\/s00159-009-0025-1. S2CID\u00a014006009.^ a b c d He\u0142miniak, K. G.; Konacki, M.; Ratajczak, M.; Muterspaugh, M. W. (2009). “Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue – I. A sample of systems with components’ masses between 1 and 2 Msolar“. Monthly Notices of the Royal Astronomical Society. 400 (2): 969. arXiv:0908.3471. Bibcode:2009MNRAS.400..969H. doi:10.1111\/j.1365-2966.2009.15513.x. S2CID\u00a016668225.^ a b c d e f g h i j k l m n Kirkby-Kent, J. A.; Maxted, P. F. L.; Serenelli, A. M.; Turner, O. D.; Evans, D. F.; Anderson, D. R.; Hellier, C.; West, R. G. (2016). “Absolute parameters for AI Phoenicis using WASP photometry”. Astronomy and Astrophysics. 591: A124. arXiv:1605.07059. Bibcode:2016A&A…591A.124K. doi:10.1051\/0004-6361\/201628581. S2CID\u00a056113989.^ a b c d Andersen, J.; Clausen, J. V.; Nordstrom, B.; Gustafsson, B.; Vandenberg, D. A. (1988). “Absolute dimensions of eclipsing binaries. XIII. AI Phoenicis\u00a0: A casestudy in stellar evolution”. Astronomy and Astrophysics. 196: 128. Bibcode:1988A&A…196..128A.^ “AI Phe”. SIMBAD. Centre de donn\u00e9es astronomiques de Strasbourg. Retrieved 17 February 2019.^ Strohmeier, W. (1972). “Three New Bright Eclipsing Binaries”. Information Bulletin on Variable Stars. 665: 1. Bibcode:1972IBVS..665….1S.^ Higl, J.; Weiss, A. (2017). “Testing stellar evolution models with detached eclipsing binaries”. Astronomy and Astrophysics. 608: A62. Bibcode:2017A&A…608A..62H. doi:10.1051\/0004-6361\/201731008.^ Sybilski, P.; Paw\u0142aszek, R. K.; Sybilska, A.; Konacki, M.; He\u0142miniak, K. G.; Koz\u0142owski, S. K.; Ratajczak, M. (2018). “Tracking spin-axis orbital alignment in selected binary systems: The Torun Rossiter-McLaughlin effect survey”. Monthly Notices of the Royal Astronomical Society. 478 (2): 1942. arXiv:1805.00520. Bibcode:2018MNRAS.478.1942S. doi:10.1093\/mnras\/sty1135. S2CID\u00a0119008317.^ Maxted, P F L; Gaulme, Patrick; Graczyk, D; He\u0142miniak, K G; Johnston, C; Orosz, Jerome A; Pr\u0161a, Andrej; Southworth, John; Torres, Guillermo; Davies, Guy R; Ball, Warrick; Chaplin, William J (11 October 2020). “The TESS light curve of AI Phoenicis”. Monthly Notices of the Royal Astronomical Society. 498 (1): 332\u2013343. arXiv:2003.09295. doi:10.1093\/mnras\/staa1662.       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